na-adjective, noun which may take the genitive case particle 'no', noun
worst of the worst; despicable; extremely bad
Emphatic expression combining 最低 and 最悪 to describe something or someone as utterly terrible, contemptible, or the absolute worst. Often used in casual, emotional speech.
That movie was the absolute worst.
His attitude is despicable.
Compound of 最低 (lowest, worst) and 最悪 (worst). The exact origin is uncertain, but it likely emerged as an emphatic colloquial expression.